Door-check.



C. R. DANA.

DOOR CHECK.

APPLICATION FILED AUG.27. I917- Patented Sept. 10,1918

INVENTOR. 'meuweyfi .Dauw

A TTORNEYS.

WITNESS:

CHAUNCEY R. DANA, OIE SAN FRANCISCO, CALIFORNIA.

DOOR-CHECK.

To all whom it may concern Be it known that LCHAUNCEY R. DANA, a citizen of the United States, residing at the city and county of San Francisco and State of California, have invented new and useful Improvements in Door-Checks, of which the followin is a specification.

This invention relates to a door check.

One of the objects of the present invention is to provide a simple, substantial, cheaply manufactured door check, which is particularly adapted for use in connection with screen doors and the like and which will efficiently check any shock or slam when a door is closed. Another object of the invention is to provide a door check which does not require dash-pots or air cushioning devices of any nature and which does not operate except when required. Further objects will hereinafter appear.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which Figure 1 is a plan view of a door and its casing, showing the application of the invention.

Fig. 2 is a central, vertical section on line 22 of Fig. 1.

Fig. 3 is a central, vertical section on line 3-3 of Fig. 2.

Referring to the drawings in detail, A indicates a screen door, or the llke, and B the casing or frame to which it is secured by the usual form of hinges. Suitably secured above the door is a U-shaped open bracket 2, and secured between the outer ends of said bracket is a coil spring 3, the tension of which may be adjusted by means of screws l. Suitably secured, as at 5, to the upper edge of the door is a bracket member consisting of two side plates 6, a toothed bottom plate 7 and a foot plate 8 by which it is secured to the door.

Pivotally mounted between the side plates 6, as at 9, is a combination bumper and stop latch generally indicated at C. This member consists of a fork-shaped lever 10, which is pivotally mounted between the plates, as shown at 9. Secured on the upper end of said lever is an upwardly extending pin or rod 11, and surrounding said rod is a resilient bumper 12 which is constructed of rubber or like material. Pivotally mounted between the lower ends of the fork-shaped Patented. Sept. 10, 1918.

Application filed. August 27, 1917. Serial No. 188,341.

lever, as at 13, is a pawl 14: and limiting the pivotal movements of said pawl within the lever 10 is a pair of lugs 15 and a rod 16.

Forming a connection between the forkshaped lever 10 and the pawl 1d to normally hold the pawl in contact with the stop lugs 15 is a coil spring 17. This spring surrounds the pivot pin 9 and one end is extended and secured to an adjusting screw 18 while the opposite end is connected with the upper end of the pawl 14:, as shown at 19. The pawl 1 1, as previously stated, is normally held in engagement with the forward lugs 15 by the pressure exerted on its upper end by the spring extension 19 and the length of the pawl is such that when said position is assumed it is elevated sufiiciently high to clear the teeth formed on the toothed base portion of the bracket plate shown at 7.

The operation of the door check when the door is open or closed will be as follows: Assuming that the door is closed, as shown in Fig. 3, and that it is opened in the direction of arrow at, then it can be seen that the bumper 12 will strike the coil spring 3 during the outward movement of the door, thus causing it,.together with the lever 10 and the pawl 1 1, to rock about the pivot 9 in the direction of arrow Z). In other words, the bumper swings clear of the spring 3 when the door is opened and it will also swing clear of the spring 3 when the door is closed, if the speed or swinging movement of the door is comparatively slow. The door will, however, be stopped if it is permitted to swing freely back to closed position, as the speed will be so great when the bumper 12 strikes the spring 3 that a jerk is imparted to the lever 10 which causes the pawl 14;

to lag behind or assume the dotted line position shown at 1%. This position of the pawl-causes it to engage with the teeth in the segment- 7 and it, therefore, locks the lever 10, together with thebumper, against movement about the pin 9. The movement of the door is in this manner checked and the entire shock is absorbed by the bumper 12 and the spring 3 which is sufficiently long to permit aconsiderable yielding movement.

The yielding movement of the spring 3 will, of course, cause the door to rebound to a certain extent and as it again returns to closing position the speed will be so slight ting the door to swing to a completely closed position and the bumper and pawl to return to the normal position shown 111 Fig. 3.

the lower end of the lever 10 is ust sufiicien to permit it to engage the teeth in the segment Tor to clear the same, and as its movement is controlled by the tension of the spring 17 and the extending ends 18 and 19,

it can readily be seen that variation or. adjustment of the tension, by the screw 18, will permit the latch to operate at any speed desired. The action of the pawl is automatic and it will only operate when the closing speed of the door is so great that a shock or slam would be produced it the speed was not checked. Lower speeds do not afi'ect the check in any manner, as it merely swings about the pivot- 9 to clear the spring 3 when engagement is made.

I The device as a whole is so simple in con struct ionthat it may be manufactured at a nominal'cost and can be sold at price with in the reach of anyone who does not feel justified in paying forthe more expensive door checks now in general use. The outer end of the pin 9, to which the lever '10 is secured, is provided with a crank arm 9* and this arm is in turn connected to a spring 25, the function of which is to normally retain the swinging check as a whole in a vertical position. I

The materials and finish of the several parts of the door check ma otherwise be such as the experience and judgment of the manufacturer ma dictate,

I wish it understood that various changes in form, proportions and minor details of construction may be resorted to Within the scope of the appended claims and that I do not wish to limit m self to the specfic design and construction here shown.

Having thus described my invention, what I claim and desire to secure by Letters Patent is- 1. A- door check comprising a bumper pivotally mounted on a door, a stop member secured to the casing of the door in the I path of travel of the bumper, and means permitting the bumper to swing about its pivot free of the stop when the closing speed of the door is less than a predetermined speed, said means including a lever, a pawl carried bv the lever, and a toothed segment with which the pawl may engage to automatically lockthe bumper against movement about its pivot when the speed is greater than the predetermined speed to' permit the bumper to strike the stop and checkthe movement of the door.

2. The'combination with a door and a casing. in which it is hingedlv mounted, of a The free or limited movement of the pawl 1% in stop member secured to the casing, a bracket member secured to the door, a bumper pivotally'mountedin the bracket, a pawl pivotally mounted on the bumper, a stop in the bracket with which said pawl is engagealole, and means for normally maintaining the pawl in position where it will not engage the said stop, said means also adapted to yield to permit the pawl to engage said stop and lock the bumper against movement about itspivot whenthe'bumper engages the casing stop with a momentum or speed beyond a predetermined speed.

3. The combination with a door and a casing in which itis hingedly mounted, of a resilient stop member secured to the casing, a bracket member secured to the door, a bumper pivotally mounted in the bracket,a pawl pivotally mounted on the bumper, a stop in the bracket with which said pawl is engageable, and ineans for normally maintaining thepawl in a position where it will not engage the said stop, said means also adapted to yield to permit the pawl to engage said stop and lock the bumper against movement about its pivot when the bumper engages the casing stop with a momentum or speed beyond a predetermined speed-.

4. The combination with a door and a casing in which it is hingedly mounted, of a resilient stop member secured to the casing, a bracket member secured to the door, a lever pivotally mounted in the bracket, a bumper secured on the upper end of the lever, a pawl pivotally secured in the lower end of the lever, a stop on the bracket with which the pawl is adapted to engage, and a spring on the lever engageable with the pawl and normally adapted to hold the pawl out of engagement with the bracket stop, said spring also adapted to yield to permit the pawl to engage said stop and lock the lever against movement about its pivot when the bumper engages the resilient stop with a momentum or speed in excess of a predetermined speed.

5. The combination with a door and a casing, in which it is hingedly mounted, of a resilient stop member secured to the casing, a bracket member secured to the door, a lever pivotally mounted in the bracket, a bumper secured on the upper end of the lever, a' pawl pivotally secured in the lower end of the lever, a stop on the bracket with and pawl carried thereby, in a vertical position.

6. The combination with a hingedly mounted door and its casing, of a bumper pivotally mounted on the door, a stop secured to the casing in the path of travel of the bumper and automatically operating means whereby the bumper may yield and pass the stop when the door is closing slowly and may be locked rigidly to encounter the stop when the door closes at excessive speeds, said means comprising a pawl pivotally attached to the bumper, a rack bar mounted adjacent the pawl and means for normally maintaining the pawl out of engagement with the rack bar.

7. The combination with a hingedly mounted door and its casing, of a bumper pivotally mounted on the door, a stop secured to the casing in the path of travel of the bumper and automatically operating means whereby the bumper may yield and pass the stop when the door is closing slowly and may be locked rigidly to encounter the stop when the door closes at excessive speeds, said means comprising a pawl pivotally attached to the bumper, a rack bar mounted adjacent the pawl, a stop member on the bumper which the pawl is adapted to engage and a spring connected with the pawl adapted to normally hold the pawl out of engagement both with the stop member and the rack bar.

8. In a device of the character described, the combination with the pivotally mounted bumper carried by the door and the stop secured to the door casing, of a pawl pivotally mounted on the bumper, a stop member ad- 7 jacent to the pawl, and means actuated by excessive momentum of the door for moving the pawl into engagement with the stop member to rigidly lock the bumper against swinging movement about its pivot, said means also adapted to hold the pawl out of engagement with the stop member when the door closes slowly.

9. In a device or the character described, the combination with the pivotally mounted bumper, or a pawl yieldably supported thereby, a stop member positioned below the pawl, means actuated by excessive closing speed of the door for moving the pawl into engagement with the stop member to rigidly secure the bumper against pivotal movement, and means for adjustably determining the minimum speed of travel at which said pawl will engage the stop.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

CI-IAUNCEY R. DANA.

Witnesses W. W. HEALEY, M. E. EWING.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0." 

